"Draven" wrote in message
.. .

"Malcolm Stewart" wrote in
message ...
"Peter James" wrote in message
.. .
kaz44 wrote:

Pack the holes with
saltpetre and plug the top of the holes with putty and leave it all
winter.

As private individuals, how can we get hold of the saltpetre (potassium
nitrate?) ?

Very difficult as it's one of the parts for making gun powder.
Would a sodium chlorate / sugar mix replace it?

Ask a chemist or a charcuterie.
Since it's also part of the way to making Salami and Salt Beef.

--
J.P. in London.